[Features of the femur periosteum and endosteum structure in rodents and hares].

General and some special histologic methods have been used to study the structure of periosteum and endosteum, as well as the morphological peculiarities of their cells in rodents and hares in the early and late postnatal ontogenesis. It is established that the periosteum of animals under study is represented by a two-layer structure: the outer (protective) layer and the inner (osteogenic) one. The outer layer consists of fibroblast-like cells, the inner one of osteogenic cells (pre-osteoblasts and osteoblasts). Endosteum is represented only by osteogenic cells and, unlike the periosteum, possesses no independent fibrillar structure; therefore, it appears to be more labile than the periosteum.